Rolling-mill for metal tubes.



M. KOCH. ROLLING MILL FOR METAL TUBES.

APPLICATION FILED MAR. 31, 1910.

- Patented Feb. 21, 1911.

- To all whom it may concern:

MAX KOCH, F RATINGEN, GERMANY.

ROLLING- MILL FOR METAL TUBES.

Be it known that I, MAX KOCH, a citizen of Germany, residing atRatingen, Germany, have invented new and useful Improvements in Rolling-Mills for Metal Tubes, of which the following is a spec fication.

This invention relates to a rolling mill of novel. construction, moreparticularly designed for rolling out metal tubes.

- In the accompanying drawing: F gure 1 is an elevation partly insection of a rolling mill embodying my invention, and Fi 2 a similarview showing the parts in a different position.

In the machine frame are journaled two sets ofrolls a, aand b, I),placed at a distance from each other, and adapted to be rotated inopposite directions. The upper rolls a, b, are adapted to bereciprocated vertically by a hydraulic piston through double rack z,pinions 1' and spindles g, in such a manner that when one of the rollsrises,

the other roll descends. With each roll pair cooperates a mandrel (Z,03' adapted to be reciprocated by friction rollers f, f and to be lockedin position by pin '0, so that it will not be retracted during therolling operation. Intermediate the machine frame and rollers f, f thereare arranged below mandrelscZ, d a pair of troughs e, e that serve tosupport the workpiece when the mandrels are withdrawn therefrom.

The tube to be'rolled is adapted to be advanced by pushers t, 25depending from car riages i, which travel on transverse beams z" andwhich are reciprocated by an electro-- moto'ror similar device 7'. Uponthe inner ends of mandrls d, d are'adaptedto be removably fitted a pairof bulged heads h, h, which may be readily slipped on or off themandrels.

lVith the position of parts indicated Fig. 1 mandrel' df is retracted,roll Z2 is raised, roll a islowere'd, mandrel (Z with its head h beingprojected between rolls a, a. The work piece. is then placed into righthand trough e and pusher t is started to advance the work piece towardrollsa, va

with the rolls, the mandrels,

Specification ofLettersI atent. Patented Feb. 21, 1911; Applicationfiled March 31, 1910. Serial No. 552,517. 7 1 i v which will thus rollit over head h. Ma1idig-cl d is then advancedand locked by a pin similarto the in 0 shown on'the left of Fig. 1, head 7:. 1s fitted on themandrel, roll a is'raised,'and roll 6 is lowered.- The pusher v2f willnowadvance the work piece toward rolls 6,6 thereby stripping head It 70below the machine frame. The work piece is thusrolled by rolls b, 5 overhead h, which operations are repeated until the tube has acquired thethickness desired. If the finished tubeis to be removed, lock pin '0 iswithdrawn and the mandrel carrying the tube is retracted, during whichmanipulation the head 72. or 72. is stripped off same.

It willbe seen, that with my improved rolling mill the mandrels donotrequire any attendance, as they remain stationary during the'reciprocative movement of the work piece. The manipulation is limitedto fitting new heads or refitting the previously slipped off heads tothe mandrels and to operating the top rolls and pushers. In this way theoperation of the mill is greatly facilitated, while time and labor areeconomized. l

I claim:' a

lfA rolling millcomprising two sets of respectively vertically alinedcooperating 80 rolls, means for rotating said roll sets in op.- positedirections, means for alternately lowering and raising the top rolls ofsaid sets, a pair of axially alined mandrels cooperating with the rolls,and heads loosely mounted upon the mandrels.

2. A rolling mill comprising two sets of ofi' mandrel at said headfalling into the pit respectively vertically 1 alined cotipera'tingrolls, means for rotating said roll sets in op posite, directions, meansfor alternately low ering and raising the 'top rollsof said sets, apairof axially alined mandrels cooperating and means for axially displacmgthe mandrels.

MAX KOCH. |'L. s.]

Wltnesses: l

IVALTER VoNNEGU'r, A. Posnw.

heads loosely mounted upon

